Prince William and Kate Middleton

Photos of the Duke and Duchess of Cambridge and their children, Prince George and Princess Charlotte Elizabeth Diana, through the years.

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Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge depart after talking to locals about mountain bikes on Montana mountain near Carcross during the Royal Tour of Canada on Sept. 28, 2016 in Carcross, Canada.

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Britain's Catherine, Duchess of Cambridge, and Princess Charlotte watch a man inflate a balloon at a children's party at Government House in Victoria, British Columbia, Canada, on Sept. 29, 2016.

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Catherine, Duchess of Cambridge and Prince George attend a party at Government House in Victoria, British Columbia, Canada, on Sept. 29, 2016, as part of a seven-day visit to Canada focusing on indigenous and environmental issues.

Britain's Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, with their children, Princess Charlotte and Prince George, attend a party at Government House in Victoria, British Columbia, Canada, on Sept. 29, 2016, as part of a seven-day visit to Canada focusing on indigenous and environmental issues.

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Kate, Duchess of Cambridge, holds an eagle feather given to her by a young girl as Prince William, the Duke of Cambridge, looks on during a welcoming ceremony in Carcross, Yukon, Canada, on Wednesday, Sept. 28, 2016.

(Credit: Getty Images / Chris Jackson)

Catherine, Duchess of Cambridge, and Prince George of Cambridge attend a children's party for Military families at Government House in Victoria, British Columbia, Canada, on Sept. 29, 2016.

Kate, the Duchess of Cambridge, smiles at Princess Charlotte while she plays with a toy during a children's party in Victoria, British Columbia, Thursday, Sept. 29, 2016.

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Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge arrive at Immigrant Services Society of BC on Sept. 25, 2016 in Vancouver, Canada. Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George and Princess Charlotte are visiting Canada as part of a weeklong visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna.

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Britain's Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, with their children, Princess Charlotte and Prince George, attend a party at Government House in Victoria, British Columbia, Canada, on Sept. 29, 2016, as part of a seven-day visit to Canada focusing on indigenous and environmental issues.

Catherine, Duchess of Cambridge, Princess Charlotte of Cambridge and Prince George of Cambridge attend a children's party for Military families at Government House in Victoria, British Columbia, Canada, on Sept. 29, 2016.

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Britain's Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, with their children, Princess Charlotte and Prince George, attend a party at Government House in Victoria, British Columbia, Canada, on Sept. 29, 2016, as part of a seven-day visit to Canada focusing on indigenous and environmental issues.

Prince George of Cambridge plays with bubbles at a children's party for Military families at Government House in Victoria, British Columbia, Canada, on Sept. 29, 2016.

(Credit: Getty Images / Chris Jackson)

Britain's Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, with their children, Princess Charlotte and Prince George, attend a party at Government House in Victoria, British Columbia, Canada, on Sept. 29, 2016, as part of a seven-day visit to Canada focusing on indigenous and environmental issues.

(Credit: Getty Images / Chris Jackson)

Prince George attends a children's party for Military families at Government House in Victoria, British Columbia, Canada, on Sept. 29, 2016.

Princess Charlotte of Cambridge plays with a dog at a children's party for Military families a children's party for Military families at Government House in Victoria, British Columbia, Canada, on Sept. 29, 2016.

(Credit: Getty Images / RICHARD POHLE)

Prince George visits the Royal International Air Tattoo at RAF Fairford with his mother Catherine, Duchess of Cambridge on July 8, 2016 in Fairford, England.

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Prince William, Duke of Cambridge and Prince George during a visit to the Royal International Air Tattoo at RAF Fairford on July 8, 2016 in Fairford, England.

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Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince George during a visit to the Royal International Air Tattoo at RAF Fairford on July 8, 2016 in Fairford, England.

(Credit: Getty Images / Chris Jackson)

Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince George sit in a Squirrel helicopter during a visit to the Royal International Air Tattoo at RAF Fairford on July 8, 2016 in Fairford, England.

Britain's Prince William poses with Princess Charlotte as they enjoy a short private break skiing in the French Alps on Thursday, March 3, 2016.

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Britain's Prince William, right, and Duchess of Cambridge with their children, Princess Charlotte, centre left, and Prince George, enjoy a short private break skiing in the French Alps on Thursday, March 3, 2016.

(Credit: John Stillwell / Pool via AP)

Britain's Prince William and Duchess of Cambridge with their children, Princess Charlotte, right, and Prince George, enjoy a short private break skiing in the French Alps on Thursday, March 3, 2016. This is the first time the family of four have taken a holiday together.

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Britain's Prince George of Cambridge on his first day at the Westacre Montessori nursery school near Sandringham in Norfolk, eastern England, on Wednesday, Jan. 6, 2016. The photograph of the third heir to the throne was taken by his mother Catherine, Duchess of Cambridge, as she and Prince William dropped him off for his first day.

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Catherine, Duchess of Cambridge, Britain's Prince William, and their two children Prince George and Princess Charlotte in late October 2015 at Kensington Palace in London.

Britain's Prince George on his first day at the Westacre Montessori nursery school near Sandringham in Norfolk, England, in a photo taken by his mother, Kate, The Duchess of Cambridge, and provided by Kensington Palace on Wednesday, Jan. 6, 2016.

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Princess Charlotte, at Anmer Hall in Sandringham, England.

(Credit: Duchess of Cambridge via AP)

Princess Charlotte with her cuddly toy dog, at Anmer Hall in Sandringham, England.

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Catherine, The Duchess of Cambridge, holding daughter Princess Charlotte, and Prince William, The Duke of Cambridge, carrying son Prince George in Sandringham, Norfolk, Britain on July 5, 2015.

(Credit: EPA / MARIO TESTINO / ART PARTNER / HANDOUT)

Prince William, The Duke of Cambridge, carrying son Prince George in Sandringham, Norfolk, Britain on July 5, 2015.

Princess Charlotte after her christening at St. Mary Magdalene Church in Sandringham, England on Sunday, July 5, 2015.

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Catherine, The Duchess of Cambridge (Front-C) holding her daughter Princess Charlotte next to her husband Prince William, The Duke of Cambridge (Front-L) with their son Prince George and Queen Elizabeth II (Front-R) in the Drawing Room of Sandringham House, Norfolk, Britain, on Sunday, July 5, 2015. In the back stand (L-R) Michael Middleton, Pippa Middleton, James Middleton, Carole Middleton, Prince Charles, The Prince of Wales and Camilla, The Duchess of Cornwall and Prince Philip, The Duke of Edinburgh.

epa04839049 A handout image provided by the Kensington Palace Press Office on 09 July 2015 shows Catherine, The Duchess of Cambridge holding her daughter Princess Charlotte in the Drawing Room at Sandringham House, Norfolk, Britain, 05 July 2015. Princess Charlotte was christening at St. Mary Magdalene Church in Sandringham on 05 July. She is the second child of the Duke and Duchess of Cambridge and fourth in line to the British throne and was born on 02 May.

(Credit: Getty Images / MATT DUNHAM)

Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge, and son, Prince George, arrive with Princess Charlotte for her christening at St. Mary Magdalene Church in Sandringham, England, on Sunday, July 5, 2015.

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Catherine, Duchess of Cambridge, carries daughter, Princess Charlotte of Cambridge, as they arrive for Charlotte's christening at St. Mary Magdalene Church in Sandringham, England, on Sunday, July 5, 2015.

Britain's Prince William and Kate, Duchess of Cambridge, leave St. Mary's Hospital's Lindo Wing in London with their newborn daughter, Charlotte Elizabeth Diana, on Saturday, May 2, 2015.

(Credit: AP / Kirsty Wigglesworth)

Kate, Duchess of Cambridge, and Prince William leave St. Mary's Hospital's Lindo Wing in London with their newborn daughter, Charlotte Elizabeth Diana, on Saturday, May 2, 2015.

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Charlotte Elizabeth Diana, daughter of Britain's Prince William and Kate, Duchess of Cambridge, was born at Mary's Hospital in London, on Saturday, May 2, 2015.

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Britain's Prince William, left, and Kate, Duchess of Cambridge, leave St. Mary's Hospital's exclusive Lindo Wing in London with their newborn daughter, Charlotte Elizabeth Diana, on Saturday, May 2, 2015.

(Credit: AP / Kirsty Wigglesworth)

Charlotte Elizabeth Diana, daughter of Britain's Prince William and Kate, Duchess of Cambridge, is all bundled up to leave St. Mary's Hospital in London on Saturday, May 2, 2015. She was born that morning.

Britain's Prince William, Duke of Cambridge, and wife Catherine, Duchess of Cambridge, show their newborn daughter, their second child, to the media outside the Lindo Wing at St. Mary's Hospital in London, on Saturday, May 2, 2015.

(Credit: Getty Images / Chad Rachman)

Britain's Prince William, the duke of Cambridge ,and Catherine, the duchess of Cambridge, arrive at The Carlyle Hotel in Manhattan on Sunday, Dec. 7, 2014. Catherine arrived at the hotel where Prince William's mother, Princess Diana, liked to stay while in the city, wearing a plum Marina coat from the maternity label Seraphine, paired with a clutch, tights and ankle boots all in black.

(Credit: Getty Images / Chad Rachman)

Britain's Prince William, the duke of Cambridge, and Catherine, the duchess of Cambridge, arrive at The Carlyle Hotel in Manhattan on Sunday, Dec. 7, 2014. Catherine arrived at the hotel wearing a plum Marina coat from the maternity label Seraphine, paired with a clutch, tights and ankle boots all in black.

(Credit: Getty Images / Chad Rachman)

Britain's Prince William, the duke of Cambridge, and Catherine, the duchess of Cambridge, arrive at The Carlyle Hotel in Manhattan on Sunday, Dec. 7, 2014. Catherine arrived at the hotel wearing a plum Marina coat from the maternity label Seraphine, paired with a clutch, tights and ankle boots all in black.

(Credit: EPA / Neilson Barnard)

Britain's Prince William, the duke of Cambridge, and Catherine, the duchess of Cambridge, arrive at The Carlyle Hotel in Manhattan on Sunday, Dec. 7, 2014. Catherine arrived at the hotel wearing a plum Marina coat from the maternity label Seraphine, paired with a clutch, tights and ankle boots all in black.

Britain's Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the ceremonial welcome ceremony for Singapore's President Tony Tan Keng Yam at the start of a state visit at Horse Guards Parade in central London on Oct. 21, 2014

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Prince William and Catherine, the Duke and Duchess of Cambridge, attend Day 9 of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club at Wimbledon in London on July 2, 2014.

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Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge, attend a remembrance ceremony in Arromanches, Normandy, on Friday, June 6, 2014, as part of the commemoration of the 70th anniversary of the World War II Allied landings in Normandy.

(Credit: Getty Images / Ian Gavan)

Prince William and Catherine, the Duke and Duchess of Cambridge, attend The Royal Variety Performance at the London Palladium theater in London on Thursday, Nov. 13, 2014.

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Prince William and wife Catherine, the Duke and Duchess of Cambridge, visit Pembroke Refinery in Pembroke, Wales, for its 50th anniversary on Saturday, Nov. 8, 2014.

Prince William and wife Catherine, the Duke and Duchess of Cambridge, visit Pembroke Refinery in Pembroke, Wales, for its 50th anniversary on Saturday, Nov. 8, 2014.

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Prince William and wife Catherine, the Duke and Duchess of Cambridge, stand guard during the welcoming of Singapore President Tony Tan Keng Yam at Horseguards Parade in London on Tuesday, Oct. 21, 2014.

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Prince William and wife Catherine, the Duke and Duchess of Cambridge, look on during their meeting with Singapore President Tony Tan Keng Yam at the Royal Garden Hotel in London on Tuesday, Oct. 21, 2014.

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Prince William and wife Catherine, the Duke and Duchess of Cambridge, walk through a sea of blood-red ceramic poppies — installed in memory of the British and Commonwealth dead from World War I — inside the moat at the Tower of London in London on Tuesday, Aug. 5, 2014.

(Credit: Getty Images / Chris Jackson)

Prince William and wife Catherine, the Duke and Duchess of Cambridge, attend a World War I commemoration ceremony at Le Mémorial Interallié in Liege, Belgium, on Monday, Aug. 4, 2014.

Prince William and wife Catherine, the Duke and Duchess of Cambridge, attend a World War I commemoration ceremony at Le Mémorial Interallié in Liege, Belgium, on Monday, Aug. 4, 2014.

(Credit: Getty Images / Chris Jackson)

Prince William and wife Catherine, the Duke and Duchess of Cambridge, watch the athletics at Hampden Park during Day Six of the Commonwealth Games in Glasgow, Scotland, on Tuesday, July 29, 2014.

(Credit: Getty Images / Chris Jackson)

Prince William and wife Catherine, the Duke and Duchess of Cambridge, meet with Games volunteers in the SSE Hydro arena during Day Five of the Commonwealth Games in Glasgow, Scotland, on Tuesday, July 28, 2014.

(Credit: Getty Images / Chris Jackson)

Prince William and wife Catherine, the Duke and Duchess of Cambridge, arrive at the SSE Hydro arena to watch gymnastics during Day Five of the Commonwealth Games in Glasgow, Scotland, on Tuesday, July 28, 2014.

(Credit: Getty Images / Chris Jackson)

Prince Harry, Prince William and wife Catherine, the Duke and Duchess of Cambridge, watch Scotland play Wales at Glasgow National Hockey Centre during Day Five of the Commonwealth Games in Glasgow, Scotland, on Tuesday, July 28, 2014.

Prince William and wife Catherine, the Duke and Duchess of Cambridge, attend the men's singles final match between Serbia's Novak Djokovic and Switzerland's Roger Federer on Day 13 of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club at Wimbledon in London on Sunday, July 6, 2014.

(Credit: Getty Images / Chris Jackson)

Prince William and wife Catherine, the Duke and Duchess of Cambridge, and Prince Harry watch as cyclist Mark Cavendish crashes near the finish line of Stage 1 of the Tour De France in Harrogate, northern England, on Saturday, July 5, 2014.

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Prince William and wife Catherine, the Duke and Duchess of Cambridge, stand on the podium at the finish of Stage 1 of the Tour De France in Harrogate, northern England, on Saturday, July 5, 2014.

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Prince William and Catherine, the Duke and Duchess of Cambridge, attend Day 9 of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club at Wimbledon in London on July 2, 2014.

(Credit: Getty Images / Pool)

Prince William and Catherine, the Duke and Duchess of Cambridge, attend Day 9 of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club at Wimbledon in London on July 2, 2014.

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge, stand on the balcony of Buckingham Palace during the "Trooping the Color" parade in London on Saturday, June 14, 2014. The annual parade marks Queen Elizabeth II's birthday, though her birth date is April 21.

(Credit: Getty Images / Remy de la Mauviniere)

Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge, attend a remembrance ceremony in Arromanches, Normandy, on Friday, June 6, 2014, as part of the commemoration of the 70th anniversary of the World War II Allied landings in Normandy.

(Credit: Getty Images / Christopher Furlong)

Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge, attend a remembrance ceremony in Arromanches, Normandy, on Friday, June 6, 2014, as part of the commemoration of the 70th anniversary of the World War II Allied landings in Normandy.

(Credit: Getty Images / Andrew Milligan)

Prince William and wife Catherine, the Duke and Duchess of Cambridge, sample whisky during a tour of The Famous Grouse Distillery in Crieff, Scotland, on Friday, May 29, 2014.

(Credit: Getty Images / Cameron Spencer)

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge watch the Bird Show at Taronga Zoo on April 20, 2014 in Sydney, Australia.

Prince William and Catherine, Duchess of Cambridge, share a smile during the ANZAC Day march at the Australian War Memorial in Canberra on April 25, 2014.

(Credit: Getty Images / Chris Jackson)

Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince George of Cambridge leave Fairbairne Airbase as they head back to the UK after finishing their Royal Visit to Australia on April 25, 2014 in Canberra, Australia.

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Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a reception hosted by the Governor General Peter Cosgrove and Her excellency Lady Cosgrove at Government House on April 24, 2014 in Canberra, Australia.

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Prince William and wife Kate, the Duchess of Cambridge, laugh during a speech by Australia's Prime Minister Tony Abbott at a reception at Australia's Parliament House in Canberra, Australia on Thursday, April 24, 2014.

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Catherine, duchess of Cambridge, carrying baby Prince George, and Prince William arrive at Wellington Military Terminal on April 7, 2014 in Wellington, New Zealand.

Catherine, duchess of Cambridge, and eight-month-old Prince George arrive at Wellington Military Terminal on April 7, 2014 in Wellington, New Zealand.

(Credit: Getty Images / Hagen Hopkins)

Catherine, duchess of Cambridge, carrying baby Prince George, and Prince William arrive at Wellington Military Terminal on April 7, 2014 in Wellington, New Zealand. The Duke and Duchess of Cambridge are on a three-week tour of Australia and New Zealand, the first official trip overseas with their eight-month-old son.

(Credit: AP / Ross Setford)

Catherine, the duchess of Cambridge, chats with school children at the official welcome ceremony Monday, April 7, 2014 at Government House, in Wellington, New Zealand.

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Catherine, the duchess of Cambridge, and Britain's Prince William, before meeting with Royal British Legion and London Poppy Day appeal staff and volunteers, at Kensington Palace in London. (Nov. 7, 2013)

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Britain's Prince William, Duke of Cambridge, and Kate, the Duchess of Cambridge, ride with television personality Barbara Windsor, second right, on a 1960s Routemaster bus on route to meeting London Poppy Day staff and volunteers. (Nov. 7, 2013)

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, talk to Queen Elizabeth II as they arrive, holding their son Prince George, at Chapel Royal in St. James's Palace. The royals were at the palace before the christening of the three month-old Prince George of Cambridge by the Archbishop of Canterbury in London. (Oct. 23, 2013)

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Prince William, Duke of Cambridge arrives, holding his son Prince George, at Chapel Royal in St. James's Palace, before the baby's christening by the Archbishop of Canterbury in London. (Oct. 23, 2013)

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Prince William, Duke of Cambridge, trains with players in the grounds of Buckingham Palace to mark the Football Association's 150th anniversary. (Oct. 7, 2013)

Prince William, Duke of Cambridge, his wife Catherine, Duchess of Cambridge, with their newborn baby boy, Prince George of Cambridge, at the Middleton family home in Bucklebury, Berkshire, in early August, 2013 and released on Aug. 19, 2013 by Kensington Palace.

Prince Charles, Prince of Wales, known as the Duke of Rothesay when in Scotland, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge, known as the Earl and Countess of Strathearn in Scotland, stand together during a visit to Dumfries House near Cumnock, south of Glasgow, Scotland. (April 5, 2013)

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Kate Middleton, Prince William, right, and his brother Prince Harry raise their wands on the film set used to depict Diagon Alley in the "Harry Potter" films during the inauguration of "Warner Bros. Studios Leavesden" near Watford, approximately 18 miles north west of central London. (April 26, 2013)

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Britain's Duchess of Cambridge, the former Kate Middleton, holds onto her husband, Prince William, as she bends down to pull the heel of her shoe out of a drainage grille as she presents the traditional sprigs of shamrocks to members of the 1st Battalion Irish Guards at the St Patrick's Day parade at Mons Barracks in Aldershot, England. (March 17, 2013)

Britain's Prince William and his wife Kate smile to the public during a walk through a central city park in Kuala Lumpur, Malaysia. (Sept. 14, 2012)

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Kate Middleton, the Duchess of Cambridge, on the cover of the September 2012 issue of Vanity Fair. British royalty has made its mark atop Vanity Fair's International Best Dressed List, with Kate Middleton and her brother-in-law, Prince Harry, both making this year's slate.

Britain's Prince William and Kate, the duchess of Cambridge, pass along The Mall as part of a four-day Diamond Jubilee celebration to mark the 60th anniversary of Queen Elizabeth's accession to the throne. (June 5, 2012)

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Catherine, Duchess of Cambridge, onboard the Spirit of Chartwell during the Thames Diamond Jubilee Pageant in London. Queen Elizabeth II and the Royal Family sailed on the ceremonial barge at the center of a 1,000-boat pageant. (June 3, 2012)

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Prince William and Kate, the Duke and Duchess of Cambridge wave from their plane before departing from their cross-Canada tour in Calgary, Alberta, Canada on Friday July 8, 2011.

Prince William and Kate, the Duke and Duchess of Cambridge, look on during a private reception at the British Consul-General's residence in Los Angeles, Friday, July 8, 2011.

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This is one of two official portrait photographs Prince William and Catherine Middleton have chosen to release to mark their engagement, taken on Nov. 25, 2010, in the Council Chamber in the State Apartment in St James' Palace.

Britain's Prince William and his then-fiance Kate Middleton during a photo call to mark their engagement, in the State Rooms of St James’s Palace, central London on Nov. 16, 2010.

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A photo from the Clarence House Press Office shows Prince William and his fiancee, Kate Middleton. Middleton appears to be a model princess -- a discreet and grounded girl with just the right amount of glamour. The 29-year-old has not put a foot wrong in her move from middle-class girl to future queen, no doubt delighting a palace worn down by the scandal of Charles and Diana's divorce and the antics of Prince Andrew and Sarah Ferguson. The wedding will be held at Westminster Abbey on April 29, 2011.

Britain's Prince William and other members of Britain's royal family arrive for a Christmas Service at St. Mary's church on the grounds of Sandringham Estate, the Queen's Norfolk retreat, England, Sunday. (Dec. 25, 2011)

Prince William revealed that he proposed using the engagement ring of his mother, Diana, Princess of Wales, to make sure she "didn't miss out on the excitement." (Nov. 16, 2010)

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Kate Middleton wears her engagement ring, which once belonged to Diana, Princess of Wales, on the day her engagement to Prince William was announced in London. William and his long-term girlfriend got engaged on holiday in Kenya last in November. (Nov.16, 2010)

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Kate Middleton wears her engagement ring, which once belonged to Diana, Princess of Wales, on the day her engagement to Prince William waa announced in London. William and his long-term girlfriend got engaged on holiday in Kenya in November. (Nov.16, 2010)

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A close up of Kate Middleton's engagement ring as she and Prince William pose for photographs in the State Apartments of St. James Palace. (Nov. 16, 2010)

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Kate Middleton with her fiance Prince William, unseen, during a television interview recorded and aired on the day they announced their engagement. (Nov.16, 2010)

Britain's Queen Elizabeth II, smiles as she is congratulated about her grandson Prince Williams' engagement to Kate Middleton, during a reception for Leaders of the Overseas Territories, at Windsor Castle in Windsor. (Nov. 16, 2010)

(Credit: AP)

The engagement ring of Britain's Lady Diana Spencer, later the Princess of Wales, seen as she poses with Prince Charles following the announcement of their engagement. Prince William was engaged to marry his long time girlfriend Kate Middleton in 2011 and gave her the same engagement ring worn by his late mother.